Machine for cutting road surfaces



Filed Nov. 4, 1954 MACHINE E. A. LENKER' FOR CUTTING ,"ROAD URFAcEs 4Sheets-Sheet 1 E. A. LENKER MACHINE FOR CUTTING ROAD- SURFACES Dec. 24,1957 .4 Sheets-Sheet 2 Filed Npv. 4, 1954 INVENTOR W QM A-r'roRfi rs vDec. 24, 1957 E. A. LENKER 2,817,275 MACHINE FOR CUTTING ROAD SURFACESFiled Nov. 4, 1954 4 Sheets-Sheet 3 INV T 4 2125 Qmmxrflw v ATTORNEYS.Dec. 24, 1957 E. A. LENKER 2,817,275 momma: FOR CUTTING ROAD SURFACESFiled 86v 4'. l 4 Sheets-Sheet 4 INVENTOR ##OQM ATTORNEYS This inventionrelates .to .a machine. for cutting road surfacesin order .to preparethem for suitable repairs. al-

though it can beused alsoas aisimple, planer for smoothing offirregularities if so desired. ,However, the main "features oftheinvention are. related to the preparation .of damagedportions of:so-called blacktop roads whereby repairs can be etfectedhaving neatjoints with the undamaged portions and also with the repaired surfacesconforming smoothly to the curvature, inclination or configuration ofthe original road.

The principal-object of theinvention is -to .pr.ovid e a machine bymeans of which a hole in the road or an irregularity in .theroad can beClltf'OlltqtO provide clean edges into which-the patchingmaterialcanbeplaced and brought to contour with the balance of the road. In

much of the a road repair work required today'it =is-necessarythan thecavity be-prepared so that its bottom inclinesor tapers toward the good"surface of the=roaid=while a-tthe same' tirneallofthe deeper portions ofthe cavity are provided with the clean edges already referred to. Myinvention has for its object the preparation of such cavities.

A further object of my invention is to provide a machine of thecharacter described which is of relatively small size andcorrespondingly light weight so that it can be readily transported,easily maneuvered in service by a single man and inexpensively operatedand maintained.

Still another object of the invention is to provide very simplemechanism for accomplishing the results desired, which mechanism can bequickly adjusted to suit the requirements of any individual job.

How the foregoing objects, together with such other objects as mayappear hereinafter or are incident to my invention, are attained isillustrated in preferred form in the accompanying drawings whereinFigure 1 is a side elevation of my improved machine;

Figure 2 is a plan view of Figure 1;

Figure 3 is a vertical section taken as indicated by the line 3--3 onFigure 1;

Figure 4 is a diagrammatic front elevation of the principal features ofconstruction but omitting the engine and driving mechanisms for the sakeof greater clarity. In this view the frame members of the machine areshown in the relative positions they will occupy in order to prepare acavity for the reception of repair material; and

Figure 5 is a diagrammatic side elevation of the structure shown inFigure 4.

As will be seen by an inspection of the drawings, the principalstructural features of my improved machine are as follows:

(1) A main frame MF composed of an open boxlike section 5 and a forwardU or channel shaped section 6 which is pivoted or jointed to the section5 by means of a pair of oppositely disposed bolts 7. The extension 6 ofthis main frame is provided with a pair of front wheels 8 mounted uponaxes 9 around which the rear end pf the section 6 can swing slightly asthe joint 7 is raised 2,8 l ?,2 7 5 Patented Dec. 24511 957 or lowered;in accordance with the description to follow.

5 gear; the, section 5 of the mainframe is provided ;with.the

"operating handlebar 12 by means of which the operator maneuvers'themachine. At the forward end a. scissors toggle 13 .reactsbetween thefront member 6a of the ,forward extension'and a t ansverse channel v5aofthe gear or box-section of the .mainframe. This scissors toggle can beextended or contracted by-means =of azscrew member. 14. operated .byawheel 15 in a manner well understood in this-art, there beinga block 16which-moves along heithread 14 as the wheel 15 is turned. Theforjwardvmembers of the scissorsare mounted to pivot around v a pin .17and the rear members around a pivot .18 in order to accommodate changesin angular relationships between-the; partsas the screw isexpanded -orcontracted. When the scissors is .contracted the forward portion'6a ofrthB GXtCHSiOH 6 will, of course, be raised and the jointed or pivotedportion '7 will be lowered,.the side :arms 6 of the forward extensionswinging on the axes 9 as already mentioned.

(2) An inner open .box-liket-frame IF-which is trunnionedon-thetransverse members 55a and 5b of :theouter frame upon fore andaft,pins,19, whereby the innerframe can be tiltedlaterally or .side-wiseiwith'respect'to the inner. -frame,.such'tilting being providedifor bymeansof .anot-her scissors toggle 20 which'reacts between the-upper,this'=end suitable inwardly projecting brackets 22-on .the

.member Sc'and outwardly projecting brackets 52310Ilth6 member 21 areprovided. The scissors toggle 20 is operated by the screw bolt 24. Thepillow blocks 25 and 26 ride along the screw and the pillow block 26abuts against the stop 27. The screw projects rearwardly and is providedwith a handle 24a by means of which it can be turned to effect therequired adjustment.

As will be seen the forward portion 28 of the inner frame projectsforwardly to a point slightly beyond the joints 7 of the main frame.Between suitable bracket members 29 is trunnioned a cutting cylinder 30,the members 29 and the cylinder 30 being carried by the forward lowercorners of the inner box-like frame. Toward the rear a power device,preferably a gasoline driven motor 31, is carried by the inner frameupon a pair of cross members 32. At a point between the engine and thecutting cylinder a counter-shaft 33 is also mounted in the side membersof the inner frame, on each end of which is a driving pinion 34. Similardriving pinions 35 are provided on each end of the cutting cylinderaxis, all of said pinions being secured to the shafts upon which theyare mounted. A chain 36 drivingly connects the corresponding pinions ateach end of the cutting cylinder. The counter-shaft 33 is also providedwith a large gear 37 which is chain driven by means of the chain 38actuated by the gear 39 on the crankshaft of the engine. A clutchmechanism 40 operated by a clutch handle 41 is provided for connectingthe engine to the driving mechanism. As will be noted, the engine, thecutting cylinder and all of the driving parts which connect the two arecarried on the inner frame IF so that they all tilt with the frame whenthe frame is rocked on its trunnions 19 so as to change the angularrelation of the cutting cylinder 30 with respect to the surface of theroad.

The functioning of the machine is probably best illustrated in thediagrammatic views of Figures 4 and 5. In these views the road surfaceappears at R. At the point where repairs are needed which requirecutting the surface to form a suitable cavity for reception of therepair material, it will be assumed that the edge 42 marks the pointwhere a hole has developed. This point should be cut to a clean edge andthe bottom should be inclined as at 43 so that whenthe cavity is readyfor reception of the repair material it will slope upwardly from the cutat 42 to the normal surface of the road at 44. There are, of course,situations where just the opposite tilt will be required or even whereboth ends of the cutting cylinder are projected downwardly into thesurface of the road to make clean edges at both sides. However, I havefound that inmost instances a tapered cut will generally suflice andnaturally such a cut will save a considerable amount of repair material.The machine is pushed along much in the manner of a lawn mower and theangular position of the cutting cylinder 30 can be quickly changed bythe operator through the medium of the scissors toggle 20 and the handle24a. The elevation of the cutting cylinder 30 can be quickly and easilyadjusted by means of the scissors toggle 13 at the forward end of themachine. Through the medium of the two toggles any desired cylinderlevel and inclination can-be quickly established and when the cuttingcylinder --is rotated the teeth 30a thereon will chew away the surfacequickly and accurately and in far less time than has been possible withany machine or manual operation with which I am presently familiar.

I claim: 1

1. A machine for cutting road surfaces comprising a main frame, a wheelat each side of said main frame secured thereto in axial alignment at apoint behind the'forward end thereof; a forward extension frame, a wheelat each side of said extension frame secured thereto in axial alignmentat a point in front of the rear end thereof; said frames being pivotallyjointed together at a point between the axes of said wheels; each ofsaid frames being adapted to swing around/the axis of its wheels andsaid pivoted joint being adapted to move upwardly and downwardly duringsuch swinging movement of the frames; means for effecting such upwardand downward movements; an inner frame trunnioned on the main frame torock laterally with respect thereto; a cutting cylinder rotatablycarried by the inner frame upon an axis which extends transversely ofthe machine; means for transversely rocking the inner frame on itstrunnion mounting whereby to alter the angular relation of the cuttingcylinder to the surface of the road; and power means for rotating thecutting cylinder.

2. A machine for cutting road surfaces comprising an outer frame mountedon front and rear wheels, said frame having a front section and a rearsection pivotally jointed together at a point between the front and therear wheels, means for lowering or raising said joint, an inner framecarried by and trunnioned on one section of the main frame for lateraltilting movement with respect to the main frame, a transversely arrangedcutting cylinder rotatably carried by the inner frame in the vicinity ofsaid joint, means reacting between the two frames for tilting the innerframe whereby to alter the angular relation of the cutting cylinder tothe surface of the road and power means for rotating the cuttingcylinder.

3. A machine according to claim 2 wherein the power means is carried bythe inner frame so as to move therewith.

4. A machine according to claim 3 wherein the power means for drivingthe cylinder includes a chain and sprocket drive at each end of thecutting cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 4 DeCamp Jan. 3, 1922 2,402,976 Olson July 2, 1946 2,510,817 Greiner et al.June 6, 1950 2,539,174 Baideme et al. Jan. 23, 1951

